Buttonhole-sewing machine.



D. NOBLE & J" SJFINGH. BUTTONHOLE SEWING MACHINE. APPLIOATION FILED DEC.19,1906.

1,082,621. Patented Ju1y'16,'1912.

13 SHEETS-"SHEET l WITNESSES 1 IN l/E N TORS,

- oo/v/uo NOBLE WM! M JOHN s, P/NCH,

E THE/f1 ATTORNEY D. N0BLE & J. s. FINGH. BUTTONHOLE SEWINGr-MAGHINE.

I APPLICATION FILED DBO.19, 1906. 1,032,621 Patented July 16, 1912. l3 SHEETS-SHEET 3.

JOHN s. F/NCH D. NOBLHfiJ. S.. FINGH. BUTTONHOLB SEWING MACHINE.

APPLICATION FILED DEG. 19, 1906. 1 3 621 9 Patented July 16, 1912.

1a SHEETSSHIET 5.

THE/R A TTORNEY.

D. NOBLE & I. S. FINOH.

BU TTONHOLE SEWING MAGHINE.

APPLI'OAITION FILED DEO.19, 1906.

Patented July 16, 1912;

13 SHEETS-SHEET 6.

INVENIORS DONALD NOBLE AND B JOHN S. PING/l 4.17,. THE/R A TTORNEY.

WITNVFLSSESQ 4 Y v .1). NQBLE & J. s. PINOH.

BUTTONHOLE SEWING MACHINE. APPLICATION-FILED DBO.19, 1906.

1 1,032,621. Patented July 16, 1912.

13 SHEETS-SHEET 7.

WITNESSES: lA/VENTORS, M manly g NOBLE JOHN s. FI/VCH.

Yfifld-:'. "Q THE/RA TTORNLY.

I D. NOBLE & J S. FINOH;

BUTTONHOLE SEWING MACHINE. APPLICATION FILED DBC.19, 190s.

Patenied July 16','1 )12.

13 SHEETS-SHEET l0.

' INVENTORS' 0 N WW M W 0 0 0 J M13 THE/R ATTORNE Y.

D. NOBLE & J. S. FINOH. BUTTONHOLE SEWING MACHINE.

APPLICATION TILED DEC. 19, 1906. l ggg ggl Patented July 16, 1912. 13 SHEETS-SHEBT 11.

IN VEN TOR-S DO/VA fi e NOBLE 0 JON/VS- F/NCH.

T HE/R ATTORNEY D. NOBLE a; J. P111011. BUTTONHOLB SEWING MACHINE. APPLICATION IILBH' DEC. 19, 190s.

Patenfied- July- 16, 1912.

'13 SHEETS-SHEET 12.

WITNESSES: ZNVENTOR.

' .DO/VALD NOBLE I I AND v ATT RNEjk-Q m JOHNS. FIYNIIICTHL- D; NOBLE & J. S. FENCE.- BUTTONHOLB SEWING MACHINE. APPLICATION FILED DEC. 19 1906.

' WITNESSZ'S:

Patented July'16,,191 2 1a sums-sauna.

[x1 ENTOR. 001mm NOBLE I A N 0 JOHN s. Fl/VCH A fro/m5).

UNITED" STATES PATENT OFFICE.

DONALD NOBiLE AND JOHN'S. FINCH, F BRIDGEPORT, CONNECTICUT, ASQIGNORS, BY

MESNE ASSIGNMENTS, 2,0 THE SINGER MANUFACTURINGCOMPANY, ACOIl'tPORA-v TION or new JERSEY.

BUTTONI-IOLE-SEWING MACHINE. a

Specification of Letters Patent.

'Pa' teiited July 16, 1912.

Application filed December 19, 1906. Serial No. 348,618.

To all'whom ilfhnay conccm: I

' Be it lno wn that DONALD NOBLE, a subject 0 the King" I Great Britain, and JOHN S. 'FINOH, a c tizenfof the United States, residentsof Bridgeport, in. the

"county of airfield and State of Conner-t1 cut, have invented certain newund useful Improvements in Buttonhole Sewing Ma+ I chines, of which-the following is a. specifica-i tion.

' Our invention relates toibut-t-onhole se\ving machines and has for its obyct toprovlde amachine of this character capablem high speed 'and increased utility, thus reducing the cost and increasing the qualit i oi the production.

The particular kind of'buttonholc which this machine is. designed to produce is comnlonly known ,as the straight, square bar ingswhichiform a part of specifi ation end as distinguished from the eyelet end and the'present construction embodies improved means for positioning the'locks oi the needle and bobbin threads on the inner cutedges of the buttonhole slit, product -ing whatis'termed purl stitch having the appearance of cainbri'c needle work.

Our invention comprises broadly .sti't'ch. form ng and y cloth feeding mechanism; 2 mechanism forgiving to the cloth clamp the ing the baning'operation; mechanism for controlling theneedle thread tension fo-rrthe,

barring operationand for releasing the nee dle thread "tension new completion oftlje sewing operation; mechanism for producing tying stitches mechanism for ccmtroll ng 1 the action of the, auxiliary takg-up, andi Inecha'ni'snvfor controlling the actuationfoi" the cutter carrying bar allot which we shall fully hereinafter desc ier'encebe'iiig had'to the accompanying d jawi n n whi h I Fi gllIY-QII 3J1 lnvert d plan or ibe and explaim-ief 1 view of our machine, Fig. 2, a vertical longitudina'l sectional elevation, partly broken,

taken in the plane indicated by the lineA,

B, on Fig. 1, Fig. 3, a vertical cross-sectional elevation, taken in the plane indicated by the line C, D, on Figs; 1 and 2, Fig. 1, a vertical cross-sectional elevation, taken in the plane indicated by the line E,F, on.

Figs. 1 and 2, Fig. 5, a vertical cross-sect1onalelevation, taken in the plane indicated by the line G, H, on Figs 1 and 2,

Fig. 6, a verticalsectional elevation, taken in the plane indicated by the line I, J, on Fig. 5, illustrating-theclutch mechanism 'for feeding the cloth-clamp slide, Fig. 7, a detailedbottom view of the feed-clutch with the plate removed, Fig. 8, a rear end elevation of ourfinachine, Fig. 9, a plan or top view of our machine, F 1g. 10, a plan view,-

partially in section, taken on a line inter secting the upper side of the base andftghe lower side of the rear portion of the Ovenhanging arm, Fig. 11, a bottg ngviewof' a'i-l portion of the base, all parts being'reinoved exceptsuch'as are employed to arrest the.

rotation of the barring cam, as will be hereinafter described, Fig. 12, a detailv broken elevation, taken in lthepl'ane indicated by 2:11

the line K, I c-n Fig ll, F ig.. 13, adetail perspective view of the barring ,caiii stoppi g buffer, Fig. 14,.a detail sectional elevn ion, taken in the plane indicated by .the

line M, N, on Fig. 11, Fig. 15, adetailplan view of the cam driving disk and the gear to which it is attached, Fig. 16. an [edge elevation of the'struct-ure shown. in plan in F ig- 15, Fig. 17, a plan view. of the bar ring cam, Fig. 18; an edge elevation of the barring cam, Fig. 19, a detail plan view of one ofthe-spring actuated latches which engage the coupl ng-pins carried by the barring cam, Fig. 20, a detail perspective view tone of such coupling-pins, Fig. 21,21 de- ,ta l. inverted'pfai; or.- bottom view of' the f'co'fitroller oam for controlling the position of the'slide'block and kindred parts, for vibrating the {clamp-Fig. 22, a side or edge elevation of the. controllercain shown in --p1an in Fig. 21, Fig. 2.3,adet-ail plan view of the. barring cam starting trigg'eiyFig. 24,

aside elevation oithe-same, Fig. 25, a detail connected therewith.

-justing screw view of the adjusting screw for controlling the length of buttonhole, Fig. 26, a detail elevation of the plate which holds said ad against end play, Fig. 27, a.

detail sectional elevation taken on the line P, Q, of Fig. 9, and Fig. 28 is a diagram of the side overseaining and barring stitches comprising the buttonhole. Fig. 29 is a plan view, partially in section, and partially in full and partially in dotted'lines,'of the tripping mechanism and the parts directly I Fig. 30 is a view, in perspective. of the tripping mechanism, embodying substantially the same parts as are illustrated in Fig. 29.

1 is the overhanging arm which is mounted upon a suitable base 2.

3 is the upper on needle actuating shaft vjourna'led in bearings 4, 5, in the arm, and connected with the hook-driving shaft 6, journaled in suitable bearings 7 S, in the base '2, by an intermediate vertical shaft 9,

which mtermesh, respectively, with said hanger carrying bevel gears 10, 11, fixed thereon, bevel gears 12, 13, carried by said upper shaft 3 and hookdriving shaft 6. Theproportions ,of the respective gears, 10, 11, 12, 13, are such that two revolutions will be imparted to the hook-driving shaft 6 for every revolution of the needle actuating shaft 3. The vertical shaft 9 is journaled in suitable bearings 14, 15, supported, respectively, by the hanger 16 and bracket 17. The hanger 16 is provided with bearings 18, 19, which encircle the upper shaft 3, by means of which is suspended and supported in position,'while the bracket 1'? is suitably secured to the base 2, as by screws 20.

Suitably secured within a central hole 21, in the bracket 17. in line withthe upper and lower shafts 3, 6, is a bushing 22 through which passes a vertical shaft the upper portion of which latter is journaled in bearlugs 24, 25, formed in the V the lower portion is journaled within said bushing Secured respectively to the upper and lower ends of the shaft 23 are gears 26, 27, which intermesh respectively with gears 28. 29. The gear 28 is tight on the upper shaft 3 and communicates motion from the latter to said vertical shaft 23, the proportions of said gears 28 and 26 being such that the vertical shaft 23 will revolve once for every two revolutions of the upper shaft 3. The gear 29 has a hub 30 which journaled within a bushing 31, also secured to the bracket 17 (see Fig. 3), said gear forming a part of a train which will be described later on.

The gear 2'? has formed thereon a feed eccentric 32 and an overseaming eccentric from which. motion is imparted to the cloth clamp through a series of connections presently to be described, for efi'ecting both,

hanger 16. while the lengthwise feed of'the buttonhole tllldv the lateral vibrations for placing the side overseam stitches.

34 is a cloth clamp slide mounted in dovetail ways 35 formed on ,the feed-slide 36, which latter is similarly mounted in clovetail ways 37 secured to the underside of the base 2, the ways 37 extending at right angles to the ways 35; and the movements of the slide 36, by which the slide 34 is carried bodily, effect the lengthwise movements or feed of the button-hole. while the movements of the slide 34, independent of and at right angles to the movements of said feed-sl'de 36, effect bothtlie overseaming of the sides of the Buttonhole and the barring of the ends.

The mechanlsm for effecting the feed movements of the slide 36 we will now de scribe. 1

38 18 a bracket secured to the underside of the base 2 in any suitable manner, as by screws 39, within which is journaled an upright shaft 40, upon the upper end of which is fastened, in any suitable manner, a pinion 41, while upon the lower end is formed aclutch-wheel 42 of any desired or approved construction, but preferably of the form shown in Figs. 5, 6. and '7, wherein said wheel is provided with two separate cylindrical compartments contain separate friction clutches 45, 46, having spring-actuated clutching pawls 4T, 48, adapted to cooperate with the internal peripheries of said clutch-wheel.

4 9 is a clutch-disk pivoted around the shaft 40 and secured rigidly to the clutch by means of a screw so that said clutch will partake of all. movements communicated to said disk.

51 is a feed-lever, one end of which isfulcrumed around a pin 52 secured to the base 2 in any suitable manner, as by screw 53, while the other end is bifurcated as shown at 54, Figs. 1 and 3, and straddles the feed eccentric 32, from which, as the latter revolves, an oscillatory movement is communicated to said lever. as will be readily understood. The'feed-lever 51 throughout a greater portion of its length is provided with an undercut groove 55, within which is slid ably fitted a T-bolt 56, the threaded end of which passes loosely through a flanged bushing 57 and has run thereon a thumb-nut 58, a washer 59' being interposed between the end of said bushing and said nut.

' 60 is a link, one end of which is pivoted around the bushing 57, while the other end is pivoted around a shouldered screw 61 secured to the clutch-disk 49, and itwill be manifest that as the lever 51 is oscillated by the feed eccentric, 32, such motion will be commnnicatedto said disk 49, the extent." .fiifinGh mOtiOn being dependent upon' the 43, 44. adapted to simply location of the T-bolt 56 in the undercut groove bolt 1S nearer into an intermittent rotary movement of the cliitch-wheel42 by reasonot the action of the clutch 45 which is effective upon said wheel in one direction only, serving to turn the same intermittently 1n the direction incheated by the arrow, Fig. 7, the return oscillation of said disk and clutch permitting the pawls 47 to slip idly upon the internal periphery of the clutch-wheel 42.

In order to prevent any reverse rotation of the clutch-wheel 4-2 during the return oscillatory movement of the clutch 45 or in a direction opposite to that indicated by the arrow, we employ the second clutch 46 which is held perfectly stationary and acts as a "detent to insure the clutch-wheel 42 being -rotated intermittently in one direction only.

-The means for holding said clutch 46 stationary comprises the cover plate (32, se cured to the bracket 38 by screws63, a. screw 64- serving to hold sald clutch and plate rigidly together.

65 is a draw-bar pivoted at one end to the iindersideof the feed-slide 36 by a shouldered screw 66, whileto the other end is rigidly secured rack-bars 6T, 68, which straddle and'are adapted to alternately engage the pinion 41. v

69 is a lever pivoted to an'extension 70 of the bracket 38 by a shouldered screw 71.

72 is a U-shaped spring secured to said lever by-screw 73, and carrying at its Iree ends pivoted rolls 74, 75-, which embrace the Outer opposite side walls of the rack-bars 6T, 68- and thereby hold the draw-bar 65 and said rack-bars resiliently poised .with

respectto the pinion 41. v

76' is a lever adjustably secured upon a vertical rock-shaft 77 by a pinch-joint 78, and 7-9 is a link one end of which is pi-votally 5'0 connected by a screw 80 to the end of said :le'ver ?(5 while the other end pivoted to 'the lever 69 by a screw 81.; The lever 76 has imparted thereto, by mechanism hereinafter to be described. a series of moveiiients which, through the connecting link 79 and lever 69,,pcsitioiistlie raclobars 67,

6S, with-respect to the pinion41 for feeding the slide 36 and parts carried thereby, first in -one direction for overseaming one side ot- '6 0 the buttoi liolc. and then in the opposite di-- .rection for ovcrseaiiiingfttlie other side of the buttonluile, and in addition.- thereto causes the feed 'to be suspended during the "barring operation by holding the rack-bars in such position that neither one is in engagement with the pinion 4-1, which latter position is clearly shown in Fig. 1.

A. shown in F 1, the parts are in the position which they' occupy when the macompletion of a biittonliole, and when again started a few barring stitches will be made, as described later on, and the rack-bar G8 the pinion 41, which will cause the feedslide 36,: and parts carried thereby, to be advanced intermittently throughout the length by the arrow 82, whereupon the draw-bar will be shifted so that neither of the rack-bars are in engagement with the pinion, at which point the barring of the second end will occur, as will later be described, after which the draw-bar 65 will again be shifted, bringing the rack-bar 67 into engagement with the pinion 4-1 and returning the slide, and parts thereon, in the direction of the arrow L3 tothe original position, at which point the initial bar completed, as soon to he described, and thema- By reason of the 'i iaiiiier in which the pinion 41- is actuated, as previously described, it willlie observed that the same is revolved intermittently throughout the entire period in which the machine is in motion, and that the engagement-of rack-bar (37 on slide 36 to take place in opposite directions. .Seciired to the base 2, by screws 84, are springs which press upwardly against cicntfriction thereon to prevent the latter ironi overthrowing when in'motion, and

time slide 36 is disconnected from the feed. Y

Formed on the rear end of the cloth clamp slide 34, parallel to the line of movement of the feed-slide 3G, is an elongated, straight slot 86 within which is slidably mounted a block 87. 1 Clheblock 87 ispivot'ed around a stud 88 secured. cntlie end of a link 89, the other end. of which lattergis pivoted at 90 to the end of a lever 91 secured rigidly to the rock-shaft 77 by a pinch joint'92. 'Also pivoted on the stud SSbei 'eath the block 87 is a flanged roll 93. Pivoted resnectivcgv to studs 94, 97,, secured rigidly to the under- -the barring operation, at which i which the huh 5 9t) clamped, means chine is autoii'iaticallvstopped after the will then be brought into engagement with the bottom of the slide 36 and exert sufli-' also attl' ord sutiicieiit triction to prevent the. accidental displacement of said slide-during o r the'fpinch-j oints 100,

of the buttonliole in the direction indicated,

.9t chine again stopped and the work adjusted.

one side and rack-bar 68 onthe opposite side of said pinion causes the feeding of the side of the frame, are bell-crank lever 0t i thelevers 96, 97, are bifurcated, as shown at ends of said levers are provided with arm).- ate slots 103, 104, within which are secured adjustable studs 105, 106.

.' 107 is an oscillating which is pivoted by a shouldered screw 108 to a bracket 109, which latter is secured to ,the bracket, 17 by screws 110.. The other end of said oscillating lever. 107 is bifurl cate'd as shown-at 111, and straddles vthe 105-, 106, secured in 2 5 1 times, as will be later overseaming eccentric 33, and it will be plain thatas said eccentricis revolvedsaid lever will be oscillated to and fro.

112," 113 are links upon the'inner ends of .which are formed studs 114,115, which fit within holes 116,117, formed in the bifurcated end of the lever 107, and are pivoted respectively at their outer ends'to the studs the arcuate slots 103, 104, formed on the outer ends of the levers The block'87 and roll 93 areatcertain described, moved by the link 89 'to'positionthe block in the slot 86 of the cloth-clamp slide 34, so that the "roll 93 will be inoperative engagement.

within one or the other of the bifurcated ,p

towardthebarring cam-133', which, as will lever 96 during the line, I (which ends 101, 102, of the levers 96, 97, said roll occupying the bifurcated end 1010f the oversea-thing of the first or left hand side of the buttonhole,,and on 'overseaming the second -or right hand side of the puttonhole said roll willIbe within -thebift rcated end 1020f .the lever 97 in either of these positions the slide 34 will be reciprocated back and forth by said levers through the link connections 112, 113. with the oscillatinglever107, the extent of such motion being dependent upon'the relative positions of thestuds 105, ate slots 103. 104. Thus it will be clear that the width of overseain at the sides of the buttonhole slit is readily increased or diminished by adjusting the studs 105, 106,

'within the :arcuate Slots 103, 104, which they respectively occupy.

The adjustment of the levers 96, 97, with respect to each other and a line intersecting ,.the axes of their fulcrums is such that-the movement of the lever 96 will be entirely on one side of said line, namely, the right hand side, (which will position the overseam stitches on the left hand side of the buttonhole), while the movement of the lever 97 will be entirely on will position the overseam stitches on the right hand side of the buttonhole);

Mounted on the cloth-clamp slide 34 on the. upper and lower sides thereof, re-spec tively, are. adjustable dogs 118. 119, adapted to cooperate with a trigger 120 secured to a lever one end of' right or away from the'needle.

' the cloth-clamp opposite to eachother,

106, in the arcuthat the latter occurs as ,hole. and to the left for the second he buttonhole; and in order that the dogs the, lefthand side of said rock-shaft 121 journaled bearings" 122, 123, formed-on the; bracket 109. "The. dog" 119; is secured to the underside offthe slide" 34 by a screw 124, and is adapted to cooperate with the lower .porti'on 125 of the trigger 120 .as said slide is moved to the left; while the dog 118 carried on the upper'side of saidslide is adapted to cooperate with the upper portion 127 of said trigger as the slide 34 is' moving in the opposite direction, to, the The dog 118 is slidably mounted on a ledge 128 4 formed on the slide 34 and takes upon the threads .of an adjusting screw 129 likewise carried by said slide. The adjustingscrew 129 isat one end journaled'so as to-turil freely in a post 130 formed on the slide 34, and at the other end has turned thereon an annular groove 131,;over whichhis fitted a plate 132 secured to theledge 128, whereby said screw is restrained against motion endwise, and by rotating said screw the' dog 118 may be positioned, relatively to the trig-' .ger 120, whereby the length of. the buttonhole may be regulated. Upon the arrival-of slide 34 at either extremity of the lengthwise feed of the buttonhole, one or the other of the dogs 118,119, will contactwith the trigger 120 and cause the up- 7 er end thereof to be thrust in a direction be presently ,describedfcauses the latter to be set in motion.

' By reference to Fig. 1, it will be observed that the motlons of the juxtaposed ends of the bell-crank levers 96 will be in directions by reason of the fact that such ends are disposed in directions diametrically opposite but are driven from the overseaming movements of the cloth-clamp slide for one side of the buttonhole as for the other, which is a great 'desideratum.

The-timing of the feed movement is; such the slide 34 moves to the right for the first side of. the buttonside of 118, 119 may notbe injured in contacting with the sides of the trigger 120 during such action, as they approach the latter in a direction lengthwise of the buttonhole, the rock-shaft 121 upon which said trigger is carried. is slidably, journaled in the bearings 122, 123. and is positioned endwise by springs 134, 135, (see Fig. 23) secured to the bracket-109. which bear, respectively, upon the ends of said shaft, so that the lattrigger 120 to yield to the pressure exerted upon the sides thereof by either of the dogs 118, 119, during such feed movement. Afterfeeding, the next subsequent 'rec'iprocatory movement of the slide 34 will withdraw whichever dog has been in contact withsaid trigger and allow the same, through the action of the springs 134., 135, to resume it s 1 normal position, which brings said trigger inpcsition directly in front. of'the dog ready to be tilted on its pivot by the succeeding reciprocatory movement of said slide 34 (Figs. 1, 2, 4 and 136 is a coil spring housed within a pocket 137 formed in the bracket 109, which bears against an offset 138 formed on said trigger,

by means of which the latter is restored to normal position after having been tiltedby either of the dogs 118, 119;-and 139 is. a headed. screw which passes through a slot 140 in said offset and is tapped into said bracket; The'screw 139 limits the action of the spring 136and affords an adjusting stop,

to correctly position the trigger 120 axially of the shaft 121.

'lieiiever the trigger 120 is rocked or I tilted by-either of' the dogs'llS, 119,-the upper extremity 141 is thrust within o'ne'of the slots 142, 143, formed in the periphery of the barring cam 133, and thereby causes the latter to be put in motion, aswill p-resently be described.

J'ournaled upon the vertical sleeve 22 which encircles the vertical shaft 23is a spur gear 144, interposed between which and the annular shoulder formedbn said sleeve is a friction, washer 145 which supports the weight of saidgear and other parts superimposed thereon. Intermeshing with the gear 144 is a pinion 146 formed on the end of a tapered shaft 147 which fits and is adapted to be driven tight within a siiiiilarly tapered hole'148 formed in the hub 30 of the gear 29.

149 is a screw tappedin the end of the tapered shaft 147- bymeans of which said parts are drawn tightly together, a washer 150 being interposed between the head of said screw and the'gear 29. a

151 is'-a washer interposed between the pinion 146 and the uppersur't'ace of the bushing 31. by means of Wl'liClI Silld pinion and connected partsare supported."

its prei 'iously described, the QQ'inte-riiieshes with the gear 27, and the proportions of the gezii's'27, 29, 144 and pinion 146 are such that ten revolutions of the gear 27 and shaft by which it 'is carried will occur during one revolution of the ,gear 144; and. by reason of the proportions of the gears 26,

28, which drive the vertical shaft 23, twentyrevolutions of the-upper shaft 8 will take place during onerevolution of said gear 144. Secured concentrically- 111)O11. i;ll6 gear 144- 'screws 152 is a cam driving disk 153' .thebarring mechanism in proper time with respect to the side stitching, as will later on be-inore fully explained.

Journaled concentrically upon the hub of the gear'144, so as to turn independently thereof, is the barring cam 133 wliichis pro-- videdat diametrically opposite points with vertically sliding bolts155, 156, upheld from engagement with the disk 153 by spring actuated latches 157, 158, pivoted at 159,-

160 within the slots 142, 143, formed in the periphery of said barring cam. When either of said bolts 155, 156, are in alineinent with the slots 154m the disk 153, and the bolt in alii'iement is depressed, said cam driving disk and barring cam are coupled together and rotated syncliroiiously,i is will presently be ex lained. The means for de DICSSiH b said bolts within the slots in tl e'disk 153 and for withdrawing the same we will now describe, reference being had particularly to Figs. 1,11, 12, 13, 14, 15 and 17. Secured to.

the underside of the 2, concentrically with the axis of the barring cam, is a circularly disposedguard-rail or ring-161 which has pivoted thereon at 162 a spring-actuated presser-ioot 163 which extends directly over the circular path travclel by the bolts 155,

.156. 164 is a coil spring interposed between the underside of the base 2' and said presser foot 163.which acts to thrust the latter downwardly,- and 165 is a. stop-screw tapped within the guardrail 161, againstwhich the heel end 166 of said presser-foot163 abuts so as to limit the downward. action thereof,

said foot being so adjusted as not to'depend beneath the lower edge of the guard rail .161, as clearly shown in Fig. 12. As eachof the bolts 155, 156 come successively beneath the presser-foot 163 the latter will be raised as clearly shown in Fig.4. causing the pres sure of'the spring 164 to be exerted to depress said bolts, the latter, however, being upheld by the latches 157, 158, which engage notches 167- cut crosswise in said bolts. will i'eiiiain in raised position until the trigger 120 has been operated to disengage the latches from the bolts. by having its end 141 thrust within whicheirr slot is at that time opposite said trigger.

Before proceeding :tu -lherwith a more do tailed,description of the various other parts connected with the operation ii the barring cam 133', we deem it advisable to state that the can] and parts carried [hereby are t\\'ie.: set in motioirand twice stopped during the operation of forming the buttonhole one half of said cam being used inthe formation 7 of each bar, and said cam is in each instance stopped in such aposition that one of the slid sbolt s 155, 156' is directly beneath the spring actuated prosser-foot163, with one of the spring actuated latches 157, 158 directly opposite thestarting trigger 120. \Vhen the trigger 120 is rocked, by engagement with either of the dogs 118, 119, as previously described, the upper extremity 141 will be thrust within one of the slots 142, 143 in .the' barring cam 133, in the. present instance, as illustrated in Figs. 2 and 4, the slot 142 being opposite said trigger, the latter will b thrust therein causing the latch 157 to release the slide-bolt 155 whereupon the latter will be depressed by the resser-foot 163 into engagement with 'the'cam driving disk 153, (it being understood that the latter is clamp slide 34 for overseaming the sides of rail 161,

in motion throughout the time the machine is running) and said bolt will be forced within one of the holes 154, thereby coupling the barring cam 133 and disk 153 together and causing said cam 133 to rotate with said 'disk 153. By reason of the lo cation of the holes 154 in the cam driving disk 153, (being stationed thirty-six degrees apart throughout the circumference) said disk can only be coupled with said cam 133 at alternate descents of the needle, whereby, as previously referred to, the movements of the barring cam 133 and other mechanism controlled thereby are maintained in-proper relation to the movements of the levers 96,

97, which effect the movements of-the cloththe buttonhole.

The barring cam 133 being put in motion as above described, continues to rotate for a half revolution thereof until arrested by the barring cam stopping mechanism, which we will now describe.

. The slide-bolts 155, 156, are provided with fingers 168, 169, which project radially through notches 170, 171, respectively, out beyond the. periphery of the barring cam 133 and are adapted to successivelyengage, at diametrically opposite points on the guarda spring cushioned buffer .172 and a spring actuated bolt shifter or raiser 173.

' The nds of the fingers 168, 169, ofthe bolts 155, 156, when depressed and in coupledvposition, project directly beneath the guardrail 161 and are thereby prevented from be ing accidentally uncoupled during the rotation of the barring cam 133; and in raised position,|the horizontal plane or path traveled by said fingers is directly within the field of the buffer 172, against which latter said fin ers 168, 169, successively abut in bringing said barring cam to rest. The

buffer 172 comprises a cylindrical body poi tion 174. fitted. within a pocket 175 formed in one end of the. guard-rail 16.1 and backed up by a coil spring 176, a rectangular end portioli 177 serving to receive the impact of said fingers 168, 169, while a stem 178 which passes througha hole made therefor in the bottom of the pocket 17 5 serves to insure a v smooth sliding motion 'withoutundue cramping. Secured to the' guard-rail 161 is a pin 179 which passes through the buffer 172and secures the latter within said-pocket, an

elongated slot 180 being formed in said buffer through which said pin passes so as to permita. limited sliding motion. The bolt shifter 17 3 is carried upon a rocking frame 181 pivoted at 182 to a bracket 183 secured to the underside of the base 2, and inter-- posed between frame 181 and bracket 183 is a coil spring 184 whose tendency is to press the beveled nose 185. against the offset portion 186 of the guard-rail 16.1. Said shifter 173 has an offset portion 187: which passes through the bifurcated end 1880f the rock- 'ing fra1ne 181 and is attached to the end of a slide 189 havingbearings in cars 190, 191, formed ,on said frame 181. Interposed betweenthe ear 190 and a collar192 carried on the slide 189 is a coil, spring 193, the'tendency of which is to keep said slide 189 and offset part of the shifter 173 pressed against the ear 190. The shifter 17 3 is also provided with a shoulder, 194 which snaps in behind the fingers 168, 169, after they have been raised in passing said shifter, and the latter takes-any rebounding action 'of the barring cam 133-which may be caused by i the spring buffer 172, such rebounding action being yildingly received through the cushion offered by the spring 193, as will be readily understood. The operation of this portion of our invention'is as follows The barring cam 133 having been put in 1110- tion, as previously described, by the trigger 120 unlatching whichever of the bolts 155, 156 happens, to be opposite thereto, and for the purpose of explanation we shall designate the bolt 155, the latter will be depressed. against the cam driving disk 153, and as soon as one of the holes 154 shall come beneath said bolt the latter will be forced therein ,by the presser-foot 163, thereby coupling barring cam 133 and cam driving disk 153 together. As the barring cam approaches the completion of a halfre\*'olution,the depressed protruding finger 168 will come in 7 contact with the beveled nose 185 of the bolt shifter 173, and said bolt will be thereby withdrawn from the hole 154 in the cam driving disk 153, the distance said bolt is ably made in two sections, 195, 196, respec end, intermediate of the levers 96, 97, and in I having clamped upon its upper? extremity by "pinion 11, and the means for transmitting movements to -groove 207Zfornied in the underside of the I revolution, except that the bolt' 156, having ing the barring of the ends of the bnttonhole said section 195 having turned thereon a -rigidly upon the hub of the "barring cam 133 the levers 76, 91, which are respectively congagementwith the cam driving disk 153, the protruding finger 169 of the other bolt 156 is about ready to contact with the. butter-172 which it shortly does, thereby bringing said barring cam 133 toa standstill.

The second half of the revolution of the barring cam 133 is brought about in a manner precisely similar to thatfor elfecting the first half revolution, and a description thereof would be merely a reiteration of the process described with reference to such first half changed places with the bolt 155, would be operated-upon in.lie1i of' the latter, and such description is, therefore, omitted.

The movements of the slide 34: for ,eiiectare transmitted from the barring cam 133, through a bell-crank lever, which we will now describe.

The barring lever,'i'o r the purpose of facility in assembling-wand initial adjustm-ent in setting up the machine, is prefertively; the section 195 having formed in one proper alinement therewith, a grooved extension 197 adapted to receive and'containthe roll 93 in similar manner asthe latter is contained by said levers, the other end of rock-shaft .198-journaled in the base-2, and

a pinch-joint 199- said section 196, upon the other end of which latter is carried a roll 200 adapted to track within the groove 201, formed in said barring cam 133; Mounted is a controller cam 202" which controls the position of roll 93'relatively to the levers 96, 97 and195, and also the position of the feed rack-bars 67 68, with respect to the'feed sai'd parts we will now de-, scribe.

Pivoted between pintles 203, 201, secured to the base 2 in.-any suitable manner, is a. verticalv rock-shaft 77 upon'theupper end of which is formed a lever 205 having on its end a roll 206'which' tracks within the block 87 to be positioned so that the roll will be in the end 197 of the barring lever 1.95, the latter, by reason of-the shape of the l; arr1ng cam groove 201 causing the clcthclamp slide 34 to be held stationary at this-period midway between its lateral moti'on limits.

U'ponstarting the machine," two descents ot the needle will occur substantially in line with the-buttonhole-- slit and in the same needle puncture, advancing the barring cam 133 and controller cam 202 thirty-six degrees, whereupon they are brought to rest :by the action of the barring cam stopping mechanism, as previously described, and are 30 not again put in motion until'the. lengthof the first side of the buttonhole has been stitched; This advancementof the barringcani 133 and controller ca'm'202 will have;

caused the .roll 206', on the lever 205,,to 5 move inwardly to the-position indicatedat 210, Fig. 21, which will have caused the'roll 93 to move out of the grooved end 197 of thelever 195 into the slotted end-101 of the lever 96, where it remains until the first sideiof -90] the buttonhole has been stitched and the cams 133,- 202, again put n motion. lVhcn the controller cam and barring cam are again;

, started at the secondend of the button-hole,

the controller; cam 202. Will,*'du1-ing the 5 period the roll 200 .is traversing the concentric'portion' 211 of the cam 133, cause the roll 206 on the end of the lever 205to'move, outwardly tot-he point indicated at 212, Fig.

21, thereby causing the roll 93 to moveou't 0 "of the slotted end 101 of the lever 96 back into the'grooved end-197 of thelever 195 where it remains until'thecompletion of the lateral vibrations imparted to the cloth clamp slide 341, by the configurations. 213, 105 214, 215, 216, 217, 218 and v219 of the barring cam 133, for making the barring stitches;

andv at the conclusion of the latter the con- "troller cam 202 causes,'the roll 206,; on the end of the lever 205, to more farther outwardly to a point indicated at 220, thereby causing the roll 93 to move out of the grooved end 197 of the lever 195 intothe] slotted end 102 of the lever97, where'itremains until the completion of overseaming the second side-of the buttofihole.

As soon as the roll 200- hasvclimbed the incline of the cam groove in the controller cam to thepoint indicated, at 220, said cam and barring cam are again'brought to astand still by the barring cam stopping mechanism, as previously described. *lYhen the barring cam'133 and controller cam 202 are again put in motlon to complete the barring of the first end'of the button'hole, (it being borne inmind that the first'two stitches upon starting the machine "are placed in n the middle ofithe bar and in the i sameneedle puncture, so as to'ni'ake a tie of the y thread ends at 'istarting) the ro1l'206 on 

